Sprouts, as I mentioned in an earlier post, are a prime suspect in microbial outbreaks. They have been implicated in many outbreaks in the United States. This is because sprouts are sprouted from minute seeds that are hard to clean, as shown in this microscopic view:

As Food Safety News explains in a long discussion of this problem, the seeds need to be dumped in bleach to kill bacteria. It’s also a really good idea to test the wash water to make sure it is free of pathogens.

The seeds are sprouted in water at room temperature, “a warm, moist climate — just perfect for a bacteria’s social life and subsequent reproduction.”

The FDA has been aware of this problem for a long time, as shown by this brief chronology:

2004: The FDA wrote a “note” to producers and shippers of sprouts stating that it was aware of 27 outbreaks of microbial illness due to sprouts and urging producers to follow the voluntary guidance procedures.